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Title: On the suppression and distortion of non-equilibrium fluctuations by transpiration

Abstract

A fluid in a nonequilibrium state exhibits long-ranged correlations of its hydrodynamic fluctuations. In this article, we examine the effect of a transpiration interface on these correlations - specifically, we consider a dilute gas in a domain bisected by the interface. The system is held in a nonequilibrium steady state by using isothermal walls to impose a temperature gradient. The gas is simulated using both direct simulation Monte Carlo (DSMC) and fluctuating hydrodynamics (FHD). For the FHD simulations, two models are developed for the interface based on master equation and Langevin approaches. For appropriate simulation parameters, good agreement is observed between DSMC and FHD results with the latter showing a significant advantage in computational speed. For each approach, we quantify the effects of transpiration on long-ranged correlations in the hydrodynamic variables. The principal effect of transpiration is a suppression of the correlations, an outcome largely explained by a reduction in the temperature gradient due to the interface. We also observe a distortion of the temperature correlations, specifically the appearance of a new peak located near the interface.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Computational Sciences and Engineering
  2. Department of Physics and Astronomy, San Jose State University, San Jose, California 95192, USA; San Jose State Univ., CA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1526600
Alternate Identifier(s):
OSTI ID: 1511897
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Fluids
Additional Journal Information:
Journal Volume: 31; Journal Issue: 5; Journal ID: ISSN 1070-6631
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ladiges, Daniel R., Nonaka, Andrew J., Bell, John B., and Garcia, Alejandro L. On the suppression and distortion of non-equilibrium fluctuations by transpiration. United States: N. p., 2019. Web. doi:10.1063/1.5093922.
Ladiges, Daniel R., Nonaka, Andrew J., Bell, John B., & Garcia, Alejandro L. On the suppression and distortion of non-equilibrium fluctuations by transpiration. United States. doi:10.1063/1.5093922.
Ladiges, Daniel R., Nonaka, Andrew J., Bell, John B., and Garcia, Alejandro L. Wed . "On the suppression and distortion of non-equilibrium fluctuations by transpiration". United States. doi:10.1063/1.5093922.
@article{osti_1526600,
title = {On the suppression and distortion of non-equilibrium fluctuations by transpiration},
author = {Ladiges, Daniel R. and Nonaka, Andrew J. and Bell, John B. and Garcia, Alejandro L.},
abstractNote = {A fluid in a nonequilibrium state exhibits long-ranged correlations of its hydrodynamic fluctuations. In this article, we examine the effect of a transpiration interface on these correlations - specifically, we consider a dilute gas in a domain bisected by the interface. The system is held in a nonequilibrium steady state by using isothermal walls to impose a temperature gradient. The gas is simulated using both direct simulation Monte Carlo (DSMC) and fluctuating hydrodynamics (FHD). For the FHD simulations, two models are developed for the interface based on master equation and Langevin approaches. For appropriate simulation parameters, good agreement is observed between DSMC and FHD results with the latter showing a significant advantage in computational speed. For each approach, we quantify the effects of transpiration on long-ranged correlations in the hydrodynamic variables. The principal effect of transpiration is a suppression of the correlations, an outcome largely explained by a reduction in the temperature gradient due to the interface. We also observe a distortion of the temperature correlations, specifically the appearance of a new peak located near the interface.},
doi = {10.1063/1.5093922},
journal = {Physics of Fluids},
number = 5,
volume = 31,
place = {United States},
year = {2019},
month = {5}
}

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